Dry shaver structure



Nov. 11, 1941. I R, KNAPP 2,262,684

may SHAVER STRUCTURE Filed Sept. 19. 1938 INVENTOR.

- fl w WW, BY y m ATTORNEYS Patented Nov. 11, 1941 DRY SHAVER STRUCTURE Raymond Knapp, Long Island City, N. Y., as

signor to Knapp-Monarch Company, St. Louis, Mo., a corporation of Missouri Application September 19, 1938, Serial No. 230,645 '4 Claims. (01.30-43) An object of my present invention is to provide a dry shaver structure in which the outer cutter and an angular supporting head therefor are integrally formed, as distinguished from the outer cutter being mounted in an angular head as shown in my copending application, Serial No. 173,104, filed November 6, 1937, patented August 19, 1941, No. 2,253,037.

Another object is to provide a dry shaver in which the outer cutter extends longitudinally from the end of the motor casing and has an angularly arranged outer end to mount the skinengaging plate of the outer cutter at the desired. angle relative to the motor casing which serves as a handle for the dry shaver, the skin-engaging plate when engaging the skin of the user permitting the motor casing to be held at a natural angle relative to the skin, such angle being the one experienced by users of safety razors.

Another object is to provide a dry shaver in which the combined outer cutter and head are retained at one end of the motor casing by interlocking coaction between the head and the casing, the casing being formed in two parts which, when assembled together, retain the head against dislodgment from the casing.

A further object is to provide a dry shaver in which the cutting face of the outer cutter is arranged at a natural shaving angle-relative to the axis of the motor casing and is formed integrally with a head member embedded in one end of the casing and having laterally extending flanges located in grooves of the head,'to prevent removal of the head from the casing.

Still a further object is to provide an outer cutter which has a comb action resulting from forming indentations therein which permit hairs which have been bent down against the skin by the outer cutter teeth, again being raised to an upstanding position, whereupon they may then pass into the teeth of the outer cutter and be sheared off by the inner cutter.

With these and other objects in view, my invention with respect to its features which I believe to be novel and patentable will be pointed out in the claims appended hereto. For a better detailed understanding of the invention, reference is made to the following description and to the accompanying drawing, in which Figure 1 is a side elevation of a dry shaver embodying my invention, a portion of the casing being broken away and other portions thereof being shown in section;

Figure 2 is a front elevation of the shaver;

Figure 3 is an enlarged sectional view on the line 3 3 of Figure 2, showing the mounting of the shaver headin the motor casing;

Figure 4 is anenlarged sectional view on the line 44 of Figure 1, showing further details of the mounting of the head in the casing;

Figure 5 is an enlarged layout view of the slot arrangement in the outer cutter of my shaver;

Figure 6 is a sectional view of a modified form of shaver head; a

Figure 7' is a sectional view' of another modified form of head;

On the accompanying drawing I have used the reference numerals I0 and I2 toindicate a dry shaver casing. The casing l0l2 is formed of two parts, with the part l2 constituting a cover and the part II] being the casing proper in which the electric motor (not shown) for driving the shaving mechanism is mounted. The starting wheel for the motor is shown at l3, where it is exposed through a slot I4 of the casing proper Ill. The cover l2 may be secured to the casing proper ID as by screws I5 passing' through the cover and intothreaded bushings l6 embedded in the casing proper l0.

I provide a head member H having an upright base portion [1 and an angular portion I8. The angular portion 18 constitutes an outer hair cutter and is provided with a row of slots l9 and two rows of slots 20. The base portion 1''! is provided with lateral flanges 2| adapted to be received in grooves Hand 23 of the casing portions l0 and l2. The flanges and. the grooves, it will be noted, terminate short of the sides of the casing, as shown in Figure 4, whereby the flanges are retained against longitudinal movement by the tained closed, but the head can be demounted I by opening the casing. This eliminates the usual set screw or other retainer means for the head relative to the casing.

The slots l9 and 20 are staggered relative to each other, as clearly shown in Figure 5. The slots 20 are arranged end to end and spacedfrom each other laterally of the cutter. The ends of the slots l9 overlap the ends of the slots 2|]. This provides unbroken metal between the ends of the slots 20 so that considerable reinforcement is thereby had for the relatively thin outer skin-engaging portion of the head H, as distinguished from the usual arrangement wherein the slots extend completely across from side to side of the head. The staggered arrangement also facilitates entry of hairs into the slots for effective shearing operation of the dry shaver.

To further aid in the shearing operation, I provide projections between the slots l9 and 20.

24 in this figure are effecting the combing action while the shaver head is being moveddownwardly v in the direction of the arrow 21.

A tubular inner cutter 28 is illustrated, which for securing the two parts of said casing together to'retain the head member mounted on the casing, said casing parts having together a substantially rectangular shape in cross section and a rectangular slot therein, grooves formed at the long sides of said slot, said head member having flanges received in said grooves, said grooves terminating short of the faces of said casing parts and having closed ends formed integral with the casing covering the ends of said flanges.

is provided with slots 29 shearingly coacting with I the slots l9 and 20. The inner cutter is rec'iproj cated relative to the outer cutter by an arm 30 oscillated by the motor in the usual manneni 3 the teeth in shearing coaction with each other. In Figure 6, I show a modification in which Spring pressed plunger pins 3| serve to" retain a head H has an. upright portion Il and an angular portion 18*. "An inner cutter 28 has slots 29 coacting withthe slots 20 of the outer cutter. Instead of having the comb teeth 24 I provide a plurality of indentations 32, 'which cause the material between the slots 20 adjacent the indentations to act as combteeth to aidin guiding the hairs into the slots; The innerl'cutter 28 has similar indentations 33 to clear'the'indentations' 32 as the inner cutter,-reciprocates i 7 relative to the outer cutter.

In Figures 1 I show'a modification .in the outer cutter, indicatedat |8, is of modified shape and'formed of sheet metal. metal may be spot welded to an angular portion I8 -of a head H" having an upright portion l'l which 1 .35 The sheet This figure also illustrates more clearly the,

spring urged, pin-3| adapted to cause the inner hair cutterlt to contact with the outer cutter. Theouter cutter in this instance is also provided with an indentation 32 whilethe inner cutter is open adjacent the indentation to avoid striking it during oscillations-of the inner'cutter.

1 In accordance with the provisions of the patent have it understood that the structure disclosed I is only illustrative; and that the invention may of the appended'claim s.

What I claim as newand desire to secure by 1 Letters Patent ofthe United States is:

1. Ina dry shaver structure, a casing comprising separatecomplementary parts positioned face to face, a head member having a base portion mounted between the two parts thereof, means be carried out by other means within the scope 1 2. In a dry shaver structure, a casing, a head member mounted on said casing, said head member having a portion forming an outer hair cutter and providedwith a skin engaging plate of uniform thicknessiarranged at an acute angle relative to the longitudinal axis of said casing, an inner hair cutter in said outer cutter, said outer and inner cutters having teeth for shearing coaction with each other upon relative reciprocation of' said cutters, said outer cutter having a plurality of shallow, curved longitudinal indentations arranged laterally across the teeth thereof which effect avcomb action for the teeth adjacent the indentations to aid in guiding hair into the teeth and said inner cutter having curved indentations surrounding the inwardly projecting portions of the indentations of said outer cutter and substantially in surface contact therewith.

. 3. In a dry shaver structureQa casing, a head member. mounted'on the casing and having a portion forming an outer hair cutter and an inner hair cutter in said outer cutter, said outer and inner cutters having teeth which shearingly coact with each other upon relative reciprocation of said cutters, said. outer cutter having a plurality of parallel longitudinal indentations across the teeth thereof depressed beneath the skin contacting surface of the face of said outer cutter which effectla comb action. on opposite sides of the indentations for the teeth adjacent the indentations to aid in guiding hair into the teeth, said'inner cutter having parallel recesses complementary to and in contact withv the inner RAYMOND KNAPR, 

